Antenna Gain Calibration for Beamformed RF Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio frequency devices struggle to accurately determine antenna gains, leading to inefficiencies and inaccuracies when adjusting transmission or reception power to comply with maximum permissible exposure requirements, as they solely rely on RFIC gains without accounting for antenna-specific variations.
Innovation Solution
A radio frequency device with multiple antennas and transmitters uses power detectors, an antenna gain lookup table, and processors to determine both RFIC and antenna gains, adjusting input powers based on total transmission or reception gains to ensure compliance with FCC guidelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the radio frequency device increases input power to ensure signal transmission, then signal strength is improved, but radiation exposure increases beyond MPE requirements
Solution Approach 1:
The device dynamically changes the power parameter based on real-time antenna gain measurements and MPE requirements. By continuously monitoring actual antenna performance and adjusting power levels accordingly, the system maintains signal strength within safe radiation limits, resolving the contradiction between transmission effectiveness and human safety.
2Device complexity
If the device uses a uniform estimate antenna gain for power adjustment, then device complexity is reduced, but measurement precision deteriorates due to antenna-specific variations
Solution Approach 1:
The device segments the power adjustment mechanism to work independently for each antenna. By measuring and controlling the gain of each antenna separately rather than using a uniform estimate, the system achieves precise power control that accounts for individual antenna characteristics, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The device implements feedback control by measuring the actual gain of each antenna and using this information to adjust power levels. This closed-loop approach ensures that power adjustments are based on real performance data rather than estimates, maintaining measurement precision while managing device complexity through systematic feedback mechanisms.
3Ease of operation
If the device does not account for antenna gain variations, then ease of operation is improved, but reliability deteriorates due to inaccurate power determination
Solution Approach 1:
The device performs self-characterization by automatically measuring and storing the gain of each antenna without requiring manual calibration or complex user intervention. This self-service approach maintains ease of operation while significantly improving reliability, as the system uses its own measured data rather than relying on manufacturer specifications or user input.
Data Source
AI summary
A radio frequency device includes antennas, transmitters, power detectors, a memory storing instructions and an antenna gain lookup table, and processors. The processors execute instructions that include instructing the transmitters to send transmission signals through the antennas to form a first beamformed signal having a first beam direction and a first frequency using multiple input powers. The instructions include determining radio frequency integrated circuit (RFIC) gains associated with the transmitters based on the transmission signals using the power detectors. Moreover, the instructions include determining the antenna gains for the antennas based on the first beam direction and the first frequency of the first beamformed signal, and the antenna gain lookup table. The instructions also include determining total gains based on the RFIC gains and the antenna gains, and adjusting the input powers based on the total gains and a back off power signal.